Fly suction device for drafting arrangements



Dec. 10, 1963 w. NAEGELI FLY SUCTION DEVICE FOR DRAFTING ARRANGEMENTSFiled Aug. 1, 1958 s In IN VEN TOR. Mae/v59 NAiGEL/ A frog/V675 UnitedStates Patent Office ."i ,ll3,35 Patented See. it), lfifi 3,113,351 FLYDEVEQE FDR DRAFTTNG ARRitNQ-EMENTS Werner Nae elli, Winterthur,Switzerland, assignor to .ioh.

.l'acoh Pieter Co, Ltd, Winterthur, Switzerland, a

corporation of Switzerland Filed Aug. l, 1953, Ser. No. 752,462 Claimspriority, application @witzerland Aug. 6, 1957 9 Claims. ((Il. 19-463)The present invention relates to a suction device for removing fly anddust from drafting arrangements in spinning machines.

In the conventional suction cleaning devices for drafting arrangementsthe suction air current is not sufficiently close to the fibrous web anddoes not effectively act on the material to seize and remove the fly assoon as it is formed. This disadvantage of the conventional cleaningdevices impairs the uniformity of the fleece. This is particularly true,if the air current is conducted towards and from the drafting rollers ina plane which is normal to the rollers. It makes no difference whetherthe current is produced by suction or by blowing. The ineffectiveness ofthe air current of conventional systems is particularly apparent, if thedistance between the nips of the pairs of drawing rollers is shortbecause in this cas there is insufficient air current in the convergingspace between the fibrous web and the zone where the distances betweenthe top rollers and the bottom rollers, respectively, are shortest.There is no room in this space for providing suction nozzles.

It is an object of the present invention to provide a suction system fordrafting arrangements in which system the fly is seized as soon as it isformed and is as much as possible removed before it settles on therollers. The system according to the invention avoids the disadvantagesof the conventional systems by conducting the air, which removes thefly, parallel to the drafting rollers. The air is drawn in on one sideof the drafting field, i.e., in the neighborhood of the bearings of thedrawing rollers and flows along the rollers parallel to the rotationaxes of the rollers and through the enclosure of the draftingarrangement on both sides of the fibrous web. The air current leaves thedrafting arrangement in the neighborhood of the bearings of the rollersat the other side of the drafting field. The cleaning air is withdrawnfrom the side of the juxtapositioned drafting arrangement which sidefaces the side from which the air is withdrawn from the first draftingarrangement so that there are two parallel juX-tapositioned outlet orair withdrawal conduits which terminate in a common suction pipe.Ambient air is drawn into the system from the room in which the drawingframe is located, to avoid any unnecessary pressure drop as is the caseif the air is drawn in through special inlet devices.

In order to make sure that the air flows parallel to the drawingrollers, the space in which the rollers are located is closed above andbelow the rollers by means of covers whose insides are provided withroller cleaning or wiping devices and with fly accumulators. Thesedevices form a seal alongside the rollers separating the inside of thedrafting arrangement in which the pressure is below atmospheric pressurefrom the air outside of the covers.

A preferred structure of the aforesaid fly accumulating and wiping meansincludes a plush-covered cushion on which the fly forms a brow which istorn off and thrown into the air current by a suitably positioned Wipingroller.

The novel features which are considered characteristic of the inventionare set forth with particularity in the appended claims. The inventionitself, however, and additional objects and advantages thereof will bestbe understood from the following description of embodiments thereof whenread in connection with the accompanying drawing, in which:

Fl'G. 1 is a perspective part sectional illustration of a draftingarrangement equipped with suction means for removing fly according tothe invention.

H6. 2 illustrates a modified portion of the suction means shown in FIG.1.

Referring more particularly to FIG. 1 of the drawing, numerals 1 and 5designate pairs of delivery rollers, numerals 4 and 7 designate pairs offeed rollers and numerals 2, 3, 6 designate drawing rollers. Thejournals of the rollers are shown only in part or are cut offaltogether. A plurality of slivers, usually six to eight, of which onlytwo are shown, enter the feed rollers through a suitable guide having anotch for each sliver. Only a portion of this guide is illustrated. Therollers form part of a preparatory drafting arrangement of a spinningmachine and are supported by means of a roller stand 8 which is locatedbetween two drafting fields. A bearing saddle 9 is mounted on the stand3 for supporting the delivery rollers 1 and 5. This saddle is notillustrated in detail because it is not part of the invention.

A bottom cover it) is secured by screws to the stand 3. This cover has arelatively wide central portion 11 and latenal portions 12 and 13 whichextend along the drafting rollers. A suction duct 14 is connected .with.the portion 12 adjacent to the central portion 11 and a suction duct isis connected with the portion 13 also adjacent to the central portionill. The ducts l d and 15 terminate in a main suction duct l6.

The central portion of a top cover 17 rests on the bottom cover 1% andcompletely covers the bearing saddle 9 and the saddles for the otherrollers which saddles are not shown. The cover 17 includes lateralportions 18 and 19.

The lateral portions 12 and 13 of the bottom cover it) have upright rims20 and 21, respectively, which are parallel to and end in closeproximity of the rollers 4, leaving only a very small clearance throughwhich air may leak in a direction which is normal to the desireddirection of the air stream Within the covers. Likewise, the lateralportions 18 and 19 of the top cover 17 have downward rims 2i? and 21,respectively, which are parallel to and end adjacent to the top rollers'7. Gn the delivery side of the drafting arrangement, the deliveryrollers l and 5 form a closure of the main dra ting field where most ofthe fly is developed. Cushions 22 are provided on the top cover 17 forforming a seal against the top rollers 5. The cushions 22 are held in aresilient holder 23 The latter has a vertical portion which is receivedin the U-shaped bottom rim 2d formed in a vertical portion 24 of the topcover portions 18 and 19'. The upper part of the resilient holder 23partly embraces the cushions 2-2 and is so bent as to press the cushionsagainst the top roller 5. The cushions are in the form of strips,preferably made of sponge rubber and have a cover which does notaccumulate fly and has a fly shedding effec Similar sealing strips 22are provided in similar, flat U-shaped holders which are mounted on thebottom cover it The central drafting rollers 2. and 3 which accumulatemuch fly are engaged by fly wiping cushions 25 and as which are similarto the cushions 22 and 22 and are supported in the bottom cover 116.

The aforedescribed covers extend fields and terminate at the end of thecover of the top rollers. There is an opening at the locality of thebearings of the rollers, not shown, which bearings are distant from thelocality where the juxtapositioned drafting fields face each other. Theair flows through these openings in the direction of the arrows 33 intothe channels formed by the covers lit and 17 and parallel to therollers. The resulting air current is on both sides of the fleece andonly over two drafting catches most of the fly developed on the fleecebefore it can settle on the rollers so that the wiping elements 22, 22,25 and 26 are substantially relieved. There is an axial air current alsobetween the rollers 2, 3 and 6 which takes along the fly wiped off bythe forward cushions 25.

The air current within the covers 12 and 18 is opposite to the currentwithin the covers 13 and 19. In order to close the ends of the chambersformed by the covers 12 and 18 and by the covers 13 and 3.9 verticalwalls 27 and 27 are provided normal to the axes of the rollers and havemarginal portions in close vicinity of the journals of the rollers,leaving as little clearance as possible.

2 illustrates a modification of the wiping means on the top roller 5.Instead of a cushion 22 which has a surface which rejects fly a cushion29 is provided which is covered with plush 28 or the like so that thefly will be accumulated and carried along to form a brow 30. Since theair current usually is insufficient to blow off the brow, a fly removalor knock-off device is provided in the form of a fluted roller 31 ofrelatively small diameter, the fluted roller resting on the top roller 5and being driven thereby. The ends of the fluted roller 31 are supportedin slots of hangers 32 which depend from the top cover portions 13 andThe longitudinal axes of the slots are directed toward the roller 5.Whenever the fibrous brow 30' grows beyond a certain length it is seizedby the ribs of the roller 31 and thrown into the space bet-ween thecovers 10 and 17 and carried away by the air current and into the commonsuction duct 16.

I claim:

I 1. In a drafting arrangement of a spinning machine including paralleland spaced drafting rollers and delivery rollers, a suction arrangementfor carrying away fly developed during the drafting operation, saidsuction arrangemnet including cover means placed parallel to saidrollers and substantially closing the spaces between said rollers to theoutside for forming an unobstructed air channel between said rollerswhich channel is parallel to said rollers and through which the materialto be drafted moves in a direction which is substantially normal to thelongitudinal axis of the channel, and means connected to said covermeans adjacent to one end of said rollers for creating an air currentflowing through said channel substantially parallel to and alongside theentire length of said rollers.

2. In a drafting arrangement according to clm'm 1 and including feedrollers, said air channel communicating with the outside at one end ofsaid rollers, said cover means having a first rim portion adjacent toone of said delivery rollers and having a second rim portion adjacent toone of said feed rollers, sealing means being mounted on said first rimportion and engaging the respective delivery roller.

3. In a drafting arrangement according to claim 1 and wherein said covermeans have a rim portion adjacent to one of the delivery rollers, flywiping means being mounted on said rim portion and engaging therespective delivery roller, a fly removal means being mounted on saidcover means in the vicinity of said fly wiping means for removing flyaccumulating on said :wiping means and throwing the removed fly intosaid air channel.

4. In a drafting arrangement of a spinning machine including a pair offeed rollers, drafting rollers, and a pair of delivery rollers, asuction arrangement for carrying away fly developed during the draftinxoperation, said suction arrangement including a top cover placed abovesaid rollers, a bottom cover-placed below said rollers, said coverscooperating with said delivery rollers and said feed rollers to form anair channel substantially sealed from the outside and containing saiddrafting rollers, said air channel being parallel to said rollers, thematerial to be drafted moving through said air channel in a directionwhich is substantially normal to the longitudinal axis of said channel,said channel being open adjacent to one end of said rollers forproviding an air inlet for said channel, and means connected to saidbottom cover adjacent to the other end of said rollers for creating anair current flowing from said air inlet through said channelsubstantially parallel to and alongside the entire length of saidrollers.

5. In a drafting arrangement as defined in claim 4 wherein said coversare stationary, fly wiping means being resiliently connected to one ofsaid covers and placed adjacent to and having substantially the samelength as one of said delivery rollers for wiping the fly off therespective delivery rollers and into said air channel.

6. In a drafting arrangement according to claim 5 and wherein said flywiping means include fly accumulating means for retaining a substantialamount of fly.

7. In a drafting arrangement according to claim 6, fly removal meansplaced close to said fly wiping means for removing the fly from saidwiping means and throwing the fly into the air channel.

8. In a drafting arrangement of a spinning machine having a plurality ofdrafting fields, each field including parallel and spaced draftingrollers and delivery rollers, a suction arrangement for carrying awayfly developed during the drafting operation, said suction arrangementincluding cover means placed parallel to said rollers and substantiallyclosing the spaces between said rollers to the outside for forming anunobstructed air channel between said rollers which channel is parallelto said rollers and through which the material to be drafted moves in adirection which is substantially normal to the longitudinal axis of thechannel, said cover means being open adjacent to one end of said rollersfor providing an air inlet to said channel, duct means connected to saidcover means adjacent to the opposite end of said rollers, and a commonair Withdrawal duct connected to said duct means of all drafting fieldsfor receiving air fromsaid duct means and creating an air currentflowing lfrom said inlets through said air channels between said rollerssubstantially parallel to and alongside the entire length of saidrollers.

9. In a drafting arrangement having serially arranged sets of top andbottom rolls, suction clearing means comprising a duct, means creating asuction within said duct, at least a portion of one of said rolls beinglocated within the duct, said duct confining the suction to a pathsubstantially longitudinal of the roll, roll wiping means located withinsaid duct, said roll wiping means engaging said portion of the roll andwiping the roll surface.

References Cited in the file of this patent UNITED STATES PATENTS2,719,334 Buchanan Oct. 4, 1955 2,719,335 Buchanan et al Oct. 4, 1955FOREIGN PATENTS 254,770 Switzerland I an. 3, 1949

9. IN A DRAFTING ARRANGEMENT HAVING SERIALLY ARRANGED SETS OF TOP ANDBOTTOM ROLLS, SUCTION CLEARING MEANS COMPRISING A DUCT, MEANS CREATING ASUCTION WITHIN SAID DUCT, AT LEAST A PORTION OF ONE OF SAID ROLLS BEINGLOCATED WITHIN THE DUCT, SAID DUCT CONFINING THE SUCTION TO A PATHSUBSTANTIALLY LONGITUDINAL OF THE ROLL, ROLL WIPING MEANS LOCATED WITHINSAID DUCT, SAID ROLL WIPING MEANS ENGAGING SAID PORTION OF THE ROLL ANDWIPING THE ROLL SURFACE.